B. L.  Turner, ?Taxonomy and nomenclature of Schkuhria pinnata (Asteraceae, Helenieae)?, Phytologia, vol. 79, pp. 364 - 368, 1996.

C. F.  Reed, ?Skeletonweed in eastern United States?, Phytologia, vol. 43, no. 2, pp. 201 - 218, 1979.

F. C.  Seymour, ?Panicum in Nicaragua?, Phytologia, vol. 32, no. 1, pp. 1 - 30, 1975.

G. L.  Nesom, ?Infrageneric taxonomy of New World Erigeron (Compositae: Astereae)?, Phytologia, vol. 67, pp. 67 - 93, 1989.

G. L.  Nesom, ?Studies in the systematics of Mexican and Texan Grindelia (Asteraceae: Astereae)?, Phytologia, vol. 68, no. 4, pp. 303 - 332, 1990.

R. L.  McGregor, ?Panicum capillare L. var. barbipulvinatum (Nash) comb. nov?, Phytologia, vol. 55, no. 4, 1984.

S. D.  Koch, ?Eragrostis mexicana, E. neomexicana, E. orcuttiana, and E. virescens: the resolution of a taxonomic problem?, Phytologia, vol. 58, no. 6, pp. 377 - 381, 1985.